When your friend- who looks strikingly like Spock from Star Trek- engages in behavior similar to cock-blocking. Often in brutally failed attempts to hook up with your girlfriend, or prevent you from doing so.

Introducing Logic into a conversation to counter an obviously asin9ine statement. Successfully.

'Man, I thought my argument supporting Arizona's immigration laws was valid. Until you pointed out that a law that circumvents The Bill of Rights for illegals, circumvents the Bill of Rights for us all. You totally Spock Blocked me!"-----Spock Blocking